Desk lamp



y 4, 1939- T. w. ROLPH 2,164,546

DESK LAMP Filed July 22, 1937 INVENTOR Thomas W Rolph ATTORNEY Patented July 4, 193

DESK LAM'P Thomas W. Rolph, Newark, Ohio, assignor to Holophane Company, Inc., New York, N. Y., a corporation of Delaware Application July 22, 1937, Serial No. 155,038

3 Claims.

The present invention relates to desk lamps, and is'more particularly directed toward desk lamps employing prismatic refractors for controlling the direction of the downwardly emitted 5 light, and opaque or substantially opaque covering and screening means about the lamp bulb and the prismatic refractor.

The lamp is designed for use on the desk to be normally below the eye level, and the screening device is arranged so that no direct light from the prismatic refractor reaches the eye at the normal angles of observation.

The accompanying drawing shows, for purposes of illustrating the present invention an embodiment in which the invention may take form, together with modifications of certain parts, it being understood that the drawing is illustrative of the invention rather than limiting the same.

In this drawing:

Figure 1 is an elevational view of a desk lam showing parts in section; and

Figures 2 and 3 are perspective views of desk lamps having modified ornamental shapes. 26' The lamp is provided with suitable pedestal l0 which supports a socket cover II and a lamp socket diagrammatically indicated at I2. The socket is mounted at the proper height to carry a single lamp bulb l3, preferably of the '75 or 100 watt size, and the upper end of the socket cover receives the neck or heel M of a prismatic member l5. This prismatic member is upwardly and outwardly flaring, and is adapted to act on the light rays, as indicated by the lines l6, l1, l8, to divert the downwardly emitted light into a beam at an angle of approximately 60 degrees with the vertical, thereby building up the illumination of the desk at points remote from the standard.

The upper open end IQ of the prismatic member I5 supports a sheet metal member, indicated at 20. The central part of this member is shown at 2| in Figure l as spherical and acts to reflect light rays back toward the light source. It may be specular or diffuse. The large diameter portion 22 of the member is, as shown in Figure l, downwardly concave, and has a depth to bring it down to the top of the fitter or socket cover l2. The under surface of the screening element 22 acts as a reflector for scattered light, so as to build up the light intensity nearer the pedestal. In the form shown the member 20 is detachably secured to the top of the glass element by spring clips, indicated at 23.

In the form shown in Figures 2 and 3, the member 20 and 20 corresponding with the cover member 20 is of different ornamental shape. Its 5 center portion acts to cover the opening in the bowl l5 and reflect light back down into the bowl, while the outer portion screens the prismatic bowl against observation from above the horizontal.

While the drawing shows the parts 20 and 2| made out of a single piece of sheet metal, it will be apparent that they could be made out of two or more pieces of sheet metal and given various shapes and configurations, also that they could be made out of material of great opacity so as to have a low enough brightness to be comfortable to the eye.

It is apparent that, within, the scope of the invention, modifications and different arrangements may be made other than is herein disclosed, and the present disclosure is illustrative merely, the invention comprehending all variations thereof.

What is claimed is:

1. A desk lamp of a height to be normally below eye level and comprising a support, a lamp socket and lamp bulb carried by the socket, an upwardly and outwardly flaring bowl having annular light condensing prisms for directing light away from the nadir to illuminate remote areas of the desk, and a combined cover and screen comprising a central opaque bulged reflector detachably secured above the opening in the bowl and the lamp bulb and resting on top of the :L bowl to reflect light back into the bowl, and a light screen extending downwardly and outwardly from the top of the bowl to substantially the bottom of the bowl to screen the bowl at angles above the horizontal, and having a wide diameter at the bottom to permit said directed light to escape.

2. A desk lamp such as claimed in claim 1, wherein the central reflector is spherical and concentric with the light source and is integral with the screen.

3. A desk lamp such as claimed in claim 1, wherein the bowl has an annular flange at the top and the combined cover and screen are integral and have spring clips to engage the flange. 5o

THOMAS W. ROLPH. 

